BTC.com does market bcash as bitcoin and bitcoin as bitcoin core.
It is a scam which tries to get people to see bcash as bitcoin.
In case you have downloaded a wallet from their site, the chances are high it is a bcash wallet (and not a bitcoin wallet).
Simply download a bitcoin wallet and import the private keys of your bcash wallet into your btc wallet. This will get you access to your BTC.
You can either download electrum (
https://electrum.org/#home) or look here to find a suitable wallet:
https://bitcoin.org/en/choose-your-wallet.